MCP Calc Tools

Instructions

Implementation Reference

• index.js:238-252 (registration)

  Registration of the 'npv' tool using ai.defineTool, including schema and inline handler.

  ai.defineTool(
    {
      name: 'npv',
      description: 'Calculate Net Present Value of cash flows',
      inputSchema: z.object({
        cashFlows: z.array(z.number()),
        rate: z.number() // discount rate as decimal
      }),
      outputSchema: z.number(),
    },
    async ({ cashFlows, rate }) => {
      return cashFlows.reduce((npv, cf, t) => 
        npv + cf / Math.pow(1 + rate, t), 0);
    }
  );

• index.js:248-251 (handler)

  Handler function computes Net Present Value by reducing cash flows discounted by the given rate using the time index as the period.

  async ({ cashFlows, rate }) => {
    return cashFlows.reduce((npv, cf, t) => 
      npv + cf / Math.pow(1 + rate, t), 0);
  }

• index.js:239-247 (schema)

  Schema definition for 'npv' tool: input requires array of cashFlows and discount rate; output is a number.

  {
    name: 'npv',
    description: 'Calculate Net Present Value of cash flows',
    inputSchema: z.object({
      cashFlows: z.array(z.number()),
      rate: z.number() // discount rate as decimal
    }),
    outputSchema: z.number(),
  },